testsuite/nsswitch/getgrent_r.c

   1 /*
   2  * Use set/get/endgrent calls from two processes to iterate over the
   3  * password database.  This checks the multithreaded stuff works.
   4  */
   5
   6 #include <stdio.h>
   7 #include <grp.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <fcntl.h>
  11 #include <errno.h>
  12 #include <wait.h>
  13
  14 void dump_grent(char *id)
  15 {
  16     struct group *gr;
  17     char fname[255];
  18     FILE *fptr;
  19
  20     /* Open results file */
  21
  22     sprintf(fname, "/tmp/getgrent_r-%s.out-%d", id, getpid());
  23
  24     if ((fptr = fopen(fname, "w")) < 0) {
  25         fprintf(stderr, "ERROR: could not open file %s: %s\n", fname,
  26                 sys_errlist[errno]);
  27         return;
  28     }
  29
  30     /* Dump group database */
  31
  32     setgrent();
  33
  34     while((gr = getgrent()) != NULL) {
  35         fprintf(fptr,"%s:%s:%d:%d\n", gr->gr_name, gr->gr_passwd,
  36                 gr->gr_gid);
  37     }
  38
  39     endgrent();
  40
  41     /* Close results file */
  42
  43     fclose(fptr);
  44 }
  45
  46 int main(int argc, char **argv)
  47 {
  48     pid_t pid;
  49
  50     /* Check args */
  51
  52     if (argc != 2) {
  53         printf("ERROR: must specify output file identifier\n");
  54         return 1;
  55     }
  56
  57     /* Fork child process */
  58
  59     if ((pid = fork()) == -1) {
  60         printf("ERROR: unable to fork\n");
  61         return 1;
  62     }
  63
  64     /* Handle test case */
  65
  66     if (pid > 0) {
  67         int status;
  68
  69         /* Parent */
  70
  71         dump_grent(argv[1]);
  72         wait(&status);
  73
  74     } else {
  75
  76         /* Child */
  77
  78         dump_grent(argv[1]);
  79         return 0;
  80     }
  81
  82     printf("PASS: run getgrent_r.c\n");
  83     return 0;
  84 }